<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
	</body>
	<script type="text/javascript">
		var a =1;
		function wrap(){
			var a = 2;
			console.log(a);
			function inner(){
				var a =3;
				console.log(a);
			}
			inner();
		}
		wrap();
		console.log(a);
	</script>
</html>
